EssC is a specificity determinant for Staphylococcus aureus type VII secretion

EssC is a specificity determinant for Staphylococcus aureus type VII secretion
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EssC 是金黄色葡萄球菌 VII 型分泌的特异性决定因素

DOI:
10.1101/252353
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Jäger F
Jäger F
中科院分区:
--
文献类型:
--
作者:
Jäger F

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VII型蛋白分泌系统(T7 SS)存在于放线菌和厚壁菌门中,在细菌的毒力和细菌间的竞争中起着重要作用。金黄色葡萄球菌中的膜结合ATP酶蛋白--β-ATP酶C,位于分泌机制的核心。S.金黄色葡萄球菌菌株可分为四种变体(C1 C1-C1 C4),它们在C-末端区域显示序列变异性。在这里,我们表明,在删除foresC 1菌株中可以产生的ESXC 2,ESXC 3和ESXC 4的变体,并且它们能够介导分泌的EsxA,分泌装置的一个重要组成部分。然而,它们不能支持底物蛋白EsxC的分泌,EsxC仅在essC 1特异性菌株中编码。这一发现表明,CD 40 C是T7蛋白分泌的特异性决定因素。我们的研究结果支持了一个模型,其中的C-末端结构域的ESTIC与底物蛋白相互作用,而EsxA在其他地方相互作用。
The type VII protein secretion system (T7SS) is found in actinobacteria and firmicutes, and plays important roles in virulence and interbacterial competition. A membrane-bound ATPase protein, EssC inStaphylococcus aureus, lies at the heart of the secretion machinery. The EssC protein fromS. aureusstrains can be grouped into four variants (EssC1–EssC4) that display sequence variability in the C-terminal region. Here we show that the EssC2, EssC3 and EssC4 variants can be produced in a strain deleted foressC1, and that they are able to mediate secretion of EsxA, an essential component of the secretion apparatus. They are, however, unable to support secretion of the substrate protein EsxC, which is only encoded inessC1-specific strains. This finding indicates that EssC is a specificity determinant for T7 protein secretion. Our results support a model in which the C-terminal domain of EssC interacts with substrate proteins, whereas EsxA interacts elsewhere.
EssC:结构域结构揭示了 VII 型分泌系统中难以捉摸的易位通道
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